Accession Number:

ADD019424

Title:

Submerged Object Detection and Classification System.

Descriptive Note:

Patent, Filed 16 Apr 93, Patented 23 Mar 99

Corporate Author:

OFFICE OF THE SECRETARY OF THE NAVY WASHINGTON DC

Report Date:

1999-03-23

Pagination or Media Count:

8.0

Abstract:

A detection and classification system for underwater objects uses a transmitting unit and a receiving unit. The transmitting unit comprises a waveform generator, a power amplifier, and a transmitting antenna. The receiving unit comprises a receiving antenna a pre-amplifer a first harmonic suppressor a digitizer, and a computer. The transmitting unit radiates an analog electromagnetic wave signal into a conductive medium such as seawater which the receiving unit detects and analyzes by a differential spectral analysis after conversion of the signal into binary code. The system uses a signal-processing method which includes the steps of determining the size of the underwater object to be detected, transmitting an electromagnetic wave with a wavelength proportioned to the size of the object, performing a spectral analysis of the received signal performing a spectral analysis at a different time or different location, comparing the two spectra performed, and analyzing the difference between the two spectra.

Subject Categories:

  • Computer Hardware
  • Electricity and Magnetism
  • Radiofrequency Wave Propagation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE